Soil Moisture Threshold of Methane Uptake in Alpine Grassland Ecosystems
文献类型：期刊论文
| 作者 | Wang, Peiyan6,7; Wang, Jinsong5,7; Wang, Song5,7; D'Imperio, Ludovica4; Elberling, Bo6; Ambus, Per3,6; Zhang, Zhen2; Ito, Akihiko1; Li, Yang7; Pan, Junxiao7 |
| 刊名 | GLOBAL CHANGE BIOLOGY
 |
| 出版日期 | 2025-02-01 |
| 卷号 | 31期号:2页码:e70062 |
| 关键词 | alpine grasslands field transect methane uptake regional estimate soil moisture threshold |
| ISSN号 | 1354-1013 |
| DOI | 10.1111/gcb.70062 |
| 产权排序 | 1 |
| 文献子类 | Article |
| 英文摘要 | Methane (CH4) uptake in alpine ecosystems is an important component of the global CH4 sink. However, large uncertainties remain regarding the magnitude and spatial patterns of CH4 uptake, owing to its extensive spatial variability, diverse controlling factors, and limited regional-scale observations. Here, we investigated field ecosystem CH4 uptake along a 3200-km transect across various alpine grasslands on the Qinghai-Tibetan Plateau (QTP). We found a substantial spatial variation in in situ CH4 uptake among alpine grasslands, with the highest rates in drier regions of the mid-western QTP. Soil moisture was the most important factor controlling CH4 uptake, exhibiting a remarkably low threshold of 6.2 +/- 0.1 v/v %. Below this threshold, CH4 uptake was constrained by soil moisture, moisture-induced nitrogen limitation, and high temperatures. Above this threshold, CH4 uptake was mainly limited by gas diffusion and low temperatures. By integrating grid predictors with a random forest model trained on 1851 field measurements encompassing both our observations and a regional synthesis across the QTP, we estimated a regional CH4 uptake of 0.88 +/- 0.020 Tg CH4 year-1 from all alpine grasslands on the QTP. This higher estimate, primarily driven by alpine steppes, was significantly greater than current regional estimates from global CH4 models. Our findings highlight the importance of CH4 sink in dry alpine ecosystems characterized by low soil moisture, suggesting that the contribution of CH4 sink in drylands may have been substantially underestimated in the current global CH4 budget. |
| URL标识 | 查看原文 |
| WOS关键词 | PROCESS-BASED MODEL ; ATMOSPHERIC METHANE ; METHANOTROPHIC ACTIVITY ; NITROGEN DEPOSITION ; TIBETAN PLATEAU ; CH4 OXIDATION ; N2O EMISSION ; FOREST SOILS ; CONSUMPTION ; TEMPERATURE |
| WOS研究方向 | Biodiversity & Conservation ; Environmental Sciences & Ecology |
| 语种 | 英语 |
| WOS记录号 | WOS:001413145300001 |
| 出版者 | WILEY |
| 源URL | [http://ir.igsnrr.ac.cn/handle/311030/212405]  |
| 专题 | 生态系统网络观测与模拟院重点实验室_外文论文 |
| 通讯作者 | Wang, Jinsong; Niu, Shuli |
| 作者单位 | 1.Univ Tokyo, Grad Sch Agr & Life Sci, Tokyo, Japan 2.Chinese Acad Sci, Inst Tibetan Plateau Res, Natl Tibetan Plateau Data Ctr TPDC, State Key Lab Tibetan Plateau Earth Syst Environm, Beijing, Peoples R China; 3.Univ Copenhagen, Ctr Landscape Res Sustainable Agr Futures Land CRA, Dept Geosci & Nat Resource Management, Copenhagen, Denmark; 4.Univ Copenhagen, Dept Geosci & Nat Resource Management, Frederiksberg, Denmark; 5.Univ Chinese Acad Sci, Coll Resources & Environm, Beijing, Peoples R China; 6.Univ Copenhagen, Ctr Permafrost CENPERM, Dept Geosci & Nat Resource Management, Copenhagen, Denmark; 7.Chinese Acad Sci, Inst Geog Sci & Nat Resources Res, Key Lab Ecosyst Network Observat & Modeling, Beijing, Peoples R China; |
| 推荐引用方式 GB/T 7714 | Wang, Peiyan,Wang, Jinsong,Wang, Song,et al. Soil Moisture Threshold of Methane Uptake in Alpine Grassland Ecosystems[J]. GLOBAL CHANGE BIOLOGY,2025,31(2):e70062. |
| APA | Wang, Peiyan.,Wang, Jinsong.,Wang, Song.,D'Imperio, Ludovica.,Elberling, Bo.,...&Niu, Shuli.(2025).Soil Moisture Threshold of Methane Uptake in Alpine Grassland Ecosystems.GLOBAL CHANGE BIOLOGY,31(2),e70062. |
| MLA | Wang, Peiyan,et al."Soil Moisture Threshold of Methane Uptake in Alpine Grassland Ecosystems".GLOBAL CHANGE BIOLOGY 31.2(2025):e70062. |
入库方式： OAI收割
来源：地理科学与资源研究所
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